From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Thierry Reding
<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Jonathan Hunter
<jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH v2 1/2] iommu/tegra: gart: Optionally check for overwriting of page mappings
Date: Fri, 13 Oct 2017 10:38:49 +0200 [thread overview]
Message-ID: <20171013083848.GA29513@8bytes.org> (raw)
In-Reply-To: <7dc66d59-3904-d1f8-3941-f9a534ff899a-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
On Thu, Oct 12, 2017 at 05:27:26PM +0300, Dmitry Osipenko wrote:
> I'm not talking about any specific bug, but in general if allocator re-maps
> already mapped region or unmaps the wrong-and-used region. I had those bug-cases
> during of development of the 'scattered' graphics allocations for Tegra20.
The dma-iommu code does not re-map already mapped regions and it doesn't
unmap wrong regions. If it does it should be reported and fixed.
So if you hit any bug there, please report it so that it can be fixed.
Thanks,
Joerg
next prev parent reply other threads:[~2017-10-13 8:38 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-04 1:02 [PATCH v2 0/2] TEGRA GART cleanup and new debug option Dmitry Osipenko
[not found] ` <cover.1507078586.git.digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
[not found] ` <cover.1507078770.git.digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-10-04 1:02 ` [PATCH v2 1/2] iommu/tegra: gart: Add optional debug checking for overwriting of page mappings Dmitry Osipenko
[not found] ` <2eadfde76987532354e419ffc98aae44e4af489a.1507078586.git.digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-10-04 1:12 ` Dmitry Osipenko
2017-10-04 1:02 ` [PATCH v2 1/2] iommu/tegra: gart: Optionally check " Dmitry Osipenko
[not found] ` <7eea4a30b0f4fdbe14351cf2c6cf537365080d2d.1507078770.git.digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-10-10 9:53 ` Joerg Roedel
[not found] ` <20171010095342.jyvzl2zex2pynqvv-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-10-12 14:27 ` Dmitry Osipenko
[not found] ` <7dc66d59-3904-d1f8-3941-f9a534ff899a-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-10-13 8:38 ` Joerg Roedel [this message]
[not found] ` <20171013083848.GA29513-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2017-10-13 12:52 ` Dmitry Osipenko
2017-10-04 1:02 ` [PATCH v2 2/2] iommu/tegra: gart: Move PFN validation out of spinlock Dmitry Osipenko
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